Use-after-free in Linux kernel - CVE-2026-89899
Published: September 17, 2026
Vulnerability identifier: #VU150392
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89899
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to compromise confidentiality, integrity, and availability.
The vulnerability exists due to a use-after-free race condition in cec_transmit_msg_fh in the CEC subsystem when a blocking transmit wait is interrupted by a signal. A local user can interrupt a blocking transmit wait with a signal to compromise confidentiality, integrity, and availability.
Affected software
Linux kernel
How to mitigate CVE-2026-89899
Install security update from vendor's repository.